Andria (Andi) P. Ellis
Serves as an Associate Coordinator of the USGS Volcano Hazards Program, ensuring scientific direction and budget are aligned with Federal priorities while supporting guidance on program development and disaster response. Also specializes in volcano geodesy with an emphasis on geodetic methods and data collection for monitoring surface deformation changes caused by magma movement.
Professional Experience
Associate Program Coordinator September 2025 – Present: USGS Volcano Hazards Program
USGS Geophysicist September 2020 - September 2025: USGS Hawaiian Volcano Observatory, Hilo, HI
Workforce Development Specialist October 2018 - September 2020: UNAVCO Inc., Boulder, CO
Software Developer January 2018 - September 2018: Esker Inc., Madison, WI
Education and Certifications
Ph.D. (2017), Geophysics, University of Wisconsin - Madison
B.S. (2011), Civil Engineering w/ Minor in Geology, University of the Pacific
Science and Products
Non-USGS Publications**
Ellis, A., DeMets, C., Briole, P., Cosenza, B., Flores, O., Graham, S.E., Guzmán-Speziale, M., Hernández, D., Kostoglodov, V., LaFemina, P. and Lord, N., 2018. GPS constraints on deformation in northern Central America from 1999 to 2017, Part 1–Time-dependent modelling of large regional earthquakes and their post-seismic effects. Geophysical Journal International, 214(3), pp.2177-2194.
Ellis, A., DeMets, C., McCaffrey, R., Briole, P., Cosenza Muralles, B., Flores, O., Guzmán-Speziale, M., Hernández, D., Kostoglodov, V., LaFemina, P. and Lord, N., 2019. GPS constraints on deformation in northern Central America from 1999 to 2017, Part 2: Block rotations and fault slip rates, fault locking and distributed deformation. Geophysical Journal International, 218(2), pp.729-754.
Ellis, A.P., DeMets, C., Briole, P., Molina, E., Flores, O., Rivera, J., Lasserre, C., Lyon-Caen, H. and Lord, N., 2015. Geodetic slip solutions for the M w= 7.4 Champerico (Guatemala) earthquake of 2012 November 7 and its postseismic deformation. Geophysical Journal International, 201(2), pp.856-868.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Filter Total Items: 16
Tiltmeter data from Mauna Loa summit stations (BLB, MCC, MLO, MOK, SLC) from January 1 to December 31, 2022 Tiltmeter data from Mauna Loa summit stations (BLB, MCC, MLO, MOK, SLC) from January 1 to December 31, 2022
Tiltmeter data from stations BLB, MCC, MLO, MOK, and SLC from January 1 to December 31, 2022, spanning the Mauna Loa 2022 eruption and unrest.
Campaign GPS measurements on the Island of Hawaiʻi collected by the Hawaiian Volcano Observatory in 2021 Campaign GPS measurements on the Island of Hawaiʻi collected by the Hawaiian Volcano Observatory in 2021
This release includes data collected during campaign GPS surveys at Kīlauea and Mauna Loa Volcanoes on the Island of Hawaiʻi in 2021. It includes data from a total of 63 sites occupied from January 1 to December 31, 2021. For each site, we include its measured raw data in daily files, Receiver INdependent EXchange (RINEX) files for each day, field log sheet(s), and associated metadata...
Tiltmeter data from Kīlauea summit stations UWE and SDH from January 1 to December 31, 2020 Tiltmeter data from Kīlauea summit stations UWE and SDH from January 1 to December 31, 2020
Tiltmeter data from borehole tilt stations UWE and SDH from January 1 to December 31, 2020, spanning a Kīlauea summit intrusion and summit eruption that began on December 20, 2020. These data were collected in 2020 by Andria P Ellis and Ingrid A Johanson of the USGS Hawaiian Volcano Observatory. The authors thank Sarah Conway for conducting the nearly monthly clock resets for these...
Colorimeter data for the summit water lake at Kīlauea Volcano, Island of Hawaiʻi, 2020 Colorimeter data for the summit water lake at Kīlauea Volcano, Island of Hawaiʻi, 2020
In 2018, a large effusive eruption on the lower flank of Kīlauea Volcano was associated with collapse and subsidence of the summit caldera floor (Neal and others, 2019). The bottom of Halemaʻumaʻu, a crater nested within the summit caldera, subsided by more than 500 m. In July 2019, water was observed ponding on the deepest part of the Halemaʻumaʻu crater floor and the water rose and...
Filter Total Items: 32
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Science and Products
Non-USGS Publications**
Ellis, A., DeMets, C., Briole, P., Cosenza, B., Flores, O., Graham, S.E., Guzmán-Speziale, M., Hernández, D., Kostoglodov, V., LaFemina, P. and Lord, N., 2018. GPS constraints on deformation in northern Central America from 1999 to 2017, Part 1–Time-dependent modelling of large regional earthquakes and their post-seismic effects. Geophysical Journal International, 214(3), pp.2177-2194.
Ellis, A., DeMets, C., McCaffrey, R., Briole, P., Cosenza Muralles, B., Flores, O., Guzmán-Speziale, M., Hernández, D., Kostoglodov, V., LaFemina, P. and Lord, N., 2019. GPS constraints on deformation in northern Central America from 1999 to 2017, Part 2: Block rotations and fault slip rates, fault locking and distributed deformation. Geophysical Journal International, 218(2), pp.729-754.
Ellis, A.P., DeMets, C., Briole, P., Molina, E., Flores, O., Rivera, J., Lasserre, C., Lyon-Caen, H. and Lord, N., 2015. Geodetic slip solutions for the M w= 7.4 Champerico (Guatemala) earthquake of 2012 November 7 and its postseismic deformation. Geophysical Journal International, 201(2), pp.856-868.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Filter Total Items: 16
Tiltmeter data from Mauna Loa summit stations (BLB, MCC, MLO, MOK, SLC) from January 1 to December 31, 2022 Tiltmeter data from Mauna Loa summit stations (BLB, MCC, MLO, MOK, SLC) from January 1 to December 31, 2022
Tiltmeter data from stations BLB, MCC, MLO, MOK, and SLC from January 1 to December 31, 2022, spanning the Mauna Loa 2022 eruption and unrest.
Campaign GPS measurements on the Island of Hawaiʻi collected by the Hawaiian Volcano Observatory in 2021 Campaign GPS measurements on the Island of Hawaiʻi collected by the Hawaiian Volcano Observatory in 2021
This release includes data collected during campaign GPS surveys at Kīlauea and Mauna Loa Volcanoes on the Island of Hawaiʻi in 2021. It includes data from a total of 63 sites occupied from January 1 to December 31, 2021. For each site, we include its measured raw data in daily files, Receiver INdependent EXchange (RINEX) files for each day, field log sheet(s), and associated metadata...
Tiltmeter data from Kīlauea summit stations UWE and SDH from January 1 to December 31, 2020 Tiltmeter data from Kīlauea summit stations UWE and SDH from January 1 to December 31, 2020
Tiltmeter data from borehole tilt stations UWE and SDH from January 1 to December 31, 2020, spanning a Kīlauea summit intrusion and summit eruption that began on December 20, 2020. These data were collected in 2020 by Andria P Ellis and Ingrid A Johanson of the USGS Hawaiian Volcano Observatory. The authors thank Sarah Conway for conducting the nearly monthly clock resets for these...
Colorimeter data for the summit water lake at Kīlauea Volcano, Island of Hawaiʻi, 2020 Colorimeter data for the summit water lake at Kīlauea Volcano, Island of Hawaiʻi, 2020
In 2018, a large effusive eruption on the lower flank of Kīlauea Volcano was associated with collapse and subsidence of the summit caldera floor (Neal and others, 2019). The bottom of Halemaʻumaʻu, a crater nested within the summit caldera, subsided by more than 500 m. In July 2019, water was observed ponding on the deepest part of the Halemaʻumaʻu crater floor and the water rose and...
Filter Total Items: 32
No results found.